Question

AJUDEM POR FAVORRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
O raio de um círculo varia a uma taxa de -2/π m/s.
A que taxa a área do círculo varia quando o raio é = 10m?

Answer 1

Resposta:

A = r² * π

dA/dt= 2r * dr/dt  * π

*****dr/dt=-(2/π)  m/s

*****r =10 m

dA/dt = 2 * 10 * (-2/π) * π

dA/dt=-40 m²/s